Double-acting pump-jack.



W. T. .PITTMAN.

DOUBLE ACTING PUMP JACK.

APPLICATION FILED AUG. 16, 1911.

1,028,959. Patented June 11,1912.

Mil /2.81211 1 foundation to a certain extent and are re- WILLIAM T. PITTMAN,'OF FORT WORTH,

TEXAS, ASSIGNOR TO CRESCENT PUMP WORKS, OF FORT WORTH, TEXAS, A CORPORATION OF TEXAS.

DOUBLE-ACTING PUMP-JACK.

Application filed August 16,

To all whom it mayco'ncem:

Be it known that I, VILLIAM T. PITTMAN, a citizen of the United States, residing at Fort Worth, county of Tarrant, State'of Texas, have invented certain newand useful Improvements in Double-Acting Pump- Jacks; and I do hereby declare the following to he a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to double acting pump jacks of the type used in connection with Artesian or other wells, and the objectof the invention is to provide a perfectly balanced pumping apparatus of eflicient and durable construction, all of the working parts of the device for operating the pump rods being above the ground level and so arranged with reference to each other as to be easily accessible for inspection and repair.

My improved pump operating mechanism also has the advantage that it embodies a minimum number of parts, and that the pump rods can not only be very easily attached to and detached from their respective cross heads but also removed from the well when so detached, without dislocating the cross heads or otherwise disturbing the main operative parts of thei'apparatus. After the rods have been detached from their cross heads they can be moved through the latter and out of the well without interference with or detachment of the cross head operating means or other elements of the mechanism.

The novel features of the invention will appear clearly from the following description and claims.

In the accompanying drawing, Figure 1 is a front elevation of a pumping jack embodying the invention; Fig. 2 is a side elevation of the same; and Fig. 3 is a top plan view of the jack.

Referring to the drawing, which shows the preferred embodiment of the invention, it will be seen that the operative parts of the pump jack are supported on a bed plate A, which, in practice, is situated at the level of the ground, and is provided with a suitable opening for telescoping pump rods S, T, which project above the bed plate or eiprocated in a vertical direction by means Specification of Letters Patent.

Patented June 11,1912,

1911. Serial No. 644,291.

of cross heads C C respectively. These cross heads are driven from a main driving shaft R which is journaled horizontally in suitable bearing members M on the bed plate A, said driving shaft having an intermediate pulley D for a suitable driving belt, and be ingdetachably positioned in the bearing members or pillow blocks M by means of removable cap pieces A, as shown. In the embodiment illustrated, the driving shaft R carries four pinions Q, arranged in pairs at opposite sides of the driving pulley, the pinions of each pair being at opposite sides of one of the bearings for the shaft. Each of the pinions Q meshes with a large gear wheel E fixed to a driven shaft X. One of these shafts X is journaled in each of the bearings M, at opposite sides of the driving pulley D, and each such shaft carries two of the gear wheels E, one at each end, i. e. at opposite sides of the corresponding bearing. The end gear wheels E serve to drive the upper cross head C. by means of connecting rods or pitmen F connected with suitable wrist pinsv on said gear wheels. as indicated at I, said pitmen having their upper ends swiveled to the outer ends of the cross head C, as indicated at Y. The wrist pins on said outer gear wheels are in line with each other, 2'. 0., lie in the same horizontal plane, and they are located diametrically opposite to other.wrist pins on the inner gear wheels E', said last named wrist pins being connected with the intermediate portion of the lower cross head C by means of pitmen G. In this way, the cross heads are driven oppositely, and as said cross heads and the parts carried thereby are given such relative weight as to make the two driven elements of the mechanism of the same weight, it will be understood that'a perfect balancing of the apparatus can be obtained.

head C is longer and heavier than the lower cross head C, but this is compensated for by placing the light inner pump rod T on the just noted.

One of the important features of my invention is that the cross heads are mounted and guided above the driving and driven shafts, and that the same guide rods are In the embodiment shown the upper cross openings located between the ends ofsaid head and the middle portion thereof, as indicated at'C. The lower ends of the guide rods N, one of which projects-upward from each bearing of the bed plate, are offset slightly from a line connecting the centers v of the wheels E, as shown in Fig. 2.

In order to hold the rods N firmly in the position indicated, each of the same is braced by means of an inclined brace rod 0, the upper end of which is suitably secured at P to the upper portion of the corresponding guide rod, while'the lower end is suitably supported on and secured to the'adjacent bearing block.

The pump rods S, T are secured to the respective cross heads by the following mechanism: The intermediate portion of the cross head C is enlarged to a certain extent and provided with an opening J which is sufficiently large not only to permitthe rods S T to be drawn through the same but also the pump casing itself. A similar opening K is formed in the intermediate portion H of the cross head C in line with the opening J. i The rod T is detachably applied to the cross head O by means of caps or plates J seated over the respective ends of the opening J and each having a central opening in which the rod T is secured in the desired adjustment in any suitable manner, as by the nuts J shown in the drawing. The tubular rod S is similarly. secured in caps or plates K by means of nuts W, said caps or plates overlying the opposite ends of the opening K in cross head C. It will there fore be understood that with this construction the pump rods can be detached from the cross heads by loosening the fastening nuts, whereupon the plates covering the respective openings in the cross heads can be removed, with the result that the pump rods and even the pum) casing and its adjunctive parts can be withdrawn in a vertical direction through the cross heads without necessitating the detachment of the latter or any disturbance whatever of the main operating elements of the mechanism. This is one of the substantial advantages provided by-my invention, and a further advantage resides in the fact that all of the parts can be made strong and durable,'the arrangement being suchthat they are all easily accessible by the attendant. The in ner rod T is guided in a stuffing box W carried by the lower cross head, preferably at a-point, above the top plate K. The stuffing box for the outer rod S is shown at V. The pump-casing can be supported from the bed plate in any vconvenient manner,.and for that reason I have not deemed it necessary to describe the pump casing and its supporting means, as the character of these will be entirely familiar to those skilled in the art. It will be understood, however, that the casing must be detachably secured in the bed plate in such a manner as to permitthe withdrawal of such casingupward through the cross heads, in the manner hereinbefore indicated. I v

One of the most important advantages of the improved pump jack is that the heavier parts are set directly on the base plate or bed close to the ground, so that there are no weighty parts projecting high in the air, which is a disadvantage of some pump jacks heretofore devised; and at the same time it is not necessary for me to arrange some of the driving parts of the jack, such 7 as the connecting rods and cross heads, be-

low the ground level, which is a defect of other prior pump jacks by reason of the fact that when said parts are so located they are 'more or less inaccessible for l!!- spection and repair. construction described above, 'all of the driving elements are so located that they can be easily reached by an operator standing on the ground adjacent the bed of the apparatus, and the stufling boxes for the res ective pump rods are likewise accessible under these conditions.

Of course I have not attempted to describe or illustrate the numerous modifications of the device which maybe made without departing from the invention, the scope of which is defined in the claims.

With the improved The stub shafts X form in reality sections of a single horizontal shaft driven by the driving shaft, especially in view of the fact that said sections are interconnected at their adjacent ends through thelower cross head.

What I claim is 1. In a double acting pump jack, the com-. bination of a bed, guide rods rising therefrom, a horizontal shaft journaled in the bed and carrying wheels arranged in pairs, I

the wheels of each pair being at opposite sides of one of the guide rods, and cross heads guided vertically on said rods, one above the other, one of said cross heads being connected to the, end wheels of the series and the other cross head being conwith the end gears, and a second cross head guided on said rods and connected. with the intermediate gears.

3. In a double acting pump jack, the combination of a bed a driving shaft journaled horizontally therein, a driven shaft journaled in the bed parallel to the'driving shaftand carrying four wheels arranged in a longitudinal series, upright guide rods rising from the bed between the intermediate and end wheels, an upper cross head guided on said rods and connected by pitmen with the end wheels, and a lower cross head guided on said rods and connected by pitmen with the intermediate wheels.

4. In a double acting pump jack, the combinationof a bed, a driving shaft journaled horizontally therein andcarrying four pinions, a driven shaft journaled in the bed parallel to the driving shaft and carrying four gears meshing with the respective pinions, guide rods rising from the bed, a pump-rod-carryi11g cross head guided by said rods and connected with the end gears on said driven shaft, and a secondpumprod-carrying cross head, below the first,

guided on said rods and connected with the intermediate gears of the series.

5. In a double acting pump jack, the combination of a bed, guide rods rising therefrom, a relatively long cross head guided on said rods at points between the center -of said head and the ends of the same, whereby the ends of the cross head project later- 35 ally beyond the guide rods, a second, relatively short cross head having its ends embracing the guide rods below the first named cross head, pump rods carried by the respective cross heads and telescoping with eachother, and means to operate the cross heads oppositely.

6. In a double acting pump jack, the combination of upright guide rods, a relatively long cross head guided on said rods and projecting atits ends beyond the same, an inner pump rod carried by said cross head, a relatively short cross head guided on said rods and having its ends embracing the latter, an outer pump rod of tubular form carried by said last named cross head and surrounding the inner pump rod, and'means to actuate said cross heads oppositely, as described.

7. In a double acting pump jack, the combination of upright guide rods, a relatively long cross head guided on said rods and projecting at its endsbeyond the same, a pump rod carried by said cross head, a

relatively short cross head guided on said rods adjacent thefirst cross head and having its ends embracing the respective rods, an outer tubular pump rod on the short cross head, surrounding the first mentioned pump rod. a'horizontal shaft below both cross heads and carrying two pairs of wheels, the wheels of each pair being located at opposite sides of one of the guide rods, means connecting the end wheels of the series with the long cross head, and means connecting the intermediate wheels of the series with the short cross head.

8. In a double acting pump jack, the combination of a base, upright guide rods rising therefrom, cross-heads guided on said guide rods, one above the other, a horizon tal shaft journaled on the base below the cross-head, means for driving said shaft, connections between the respective ends of said shaft and the upper'cross-head, and connections between the shaft and lower cross-head intermediate the first named con.-

nections.

9. In a double acting pump jack, the combination of a bed, upright guide rods rising therefrom, cross heads guided on said rods,

ing the respective wheels-with the ends of one of the cross head and an operative connection between the ntermediate portion of said shaft and the intermediate portions of the other cross head,

10. In a double acting pump jack, the combination of a bed, upright guide rods risingtherefrom, pump-rod-carrying cross heads guided on said rods, one above the other, a driving shaft journaled horizontally on said bed and carrying four pinions, a. driven shaft journaled horizontally on said bed parallel to the driving shaft and carrying four gears meshing with the respective pinions, both of said shafts being located below the cross heads, and means connecting the end gears with one cross head and the intermediate gears with the other cross head.

11. In a double acting pump jack, the combination of a bed, upright guide rods rising therefrom, cross heads guided on said rods, one above the other, a horizontal shaft journaled on the bed belowsaid cross heads, means for driving said shaft, wheels on the intermediate portion of said shaft, each operatively' connected with the lower cross head, and operative. connections between the respective end portions of the shaft and the upper cross head.

12. In a double acting pump jack, the combination of upright guide rods, cross heads guided on said rods and having alined openings, and means to detachablysecure pump rods-in the respective openings, the pump rods when detached being movable upwardly through both of said openings and out of the well. I

13. In a double acting pump jack,.the combination of upright guide rods, cross heads guided on said rods and having alined &

openings, and means to secure detachably inner and outer pump rods in the respective openings, the latter being of such size that when thepump rods are detached the same together with the pump casing can be moved upwardly through the cross heads and out of the well.

14. In a double acting pump jack, the

' combination of a bed, upright guide rods rising therefrom, a shaft journaled. horizontally on said bed, upper and lower cross heads-guided on said rods, the upper cross head extending laterally at its ends beyond the guide rods, means connecting the ends of said upper cross head to said shaft, and.

means connecting the intermediate'portion of the lower cross head to "said shaft.

-15. In a double acting pump jack, the

combination of a bed, upright guide rods rising therefrom, an upper cross head guided on said guide rods and extending at its ends laterally 'beyond said rods, a lower cross head guided on said rods, a hori zontal shaft journaled on the bed, means connecting said lower cross head with the intermediate port-ion of said shaft, Wheels on the ends of said shaft, and pitmen connecting said wheels with the respective ends of the upper cross head.

In testimony whereof I aflixmy signature,

in presence of two witnesses.

WILLIAM T. PITTMAN.

Witnesses:

H. E. ROCK ELL, N. M. DONN. 

